headers: update auxvec.h from Linux kernel

Pull a new version of auxvec.h from the upstream Linux
kernel at commit b719f43059903820c31edb30f4663a2818836e7f

These files were generated using the following commands:

cd bionic/libc/kernel
./tools/clean_header.py -u ../../../external/kernel-headers/original/uapi/linux/auxvec.h
./tools/clean_header.py -u ../../../external/kernel-headers/original/linux/auxvec.h
./tools/clean_header.py -u ../../../external/kernel-headers/original/asm-x86/auxvec.h

This change is needed to get AT_RANDOM defined.

Change-Id: Ib064649684b17af6ff4b1a31d501a05f78bb81d0